WO2010107272A2 - Procédé et appareil de traitement de modifications d'abonnement csg dans un système de communication sans fil - Google Patents

Procédé et appareil de traitement de modifications d'abonnement csg dans un système de communication sans fil Download PDF

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Publication number
WO2010107272A2
WO2010107272A2 PCT/KR2010/001705 KR2010001705W WO2010107272A2 WO 2010107272 A2 WO2010107272 A2 WO 2010107272A2 KR 2010001705 W KR2010001705 W KR 2010001705W WO 2010107272 A2 WO2010107272 A2 WO 2010107272A2
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csg
cell
terminal
layer
expiration
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PCT/KR2010/001705
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English (en)
Korean (ko)
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WO2010107272A3 (fr
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정성훈
천성덕
이승준
이영대
박성준
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엘지전자주식회사
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Priority to US13/201,445 priority Critical patent/US8483684B2/en
Publication of WO2010107272A2 publication Critical patent/WO2010107272A2/fr
Publication of WO2010107272A3 publication Critical patent/WO2010107272A3/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W60/00—Affiliation to network, e.g. registration; Terminating affiliation with the network, e.g. de-registration
    • H04W60/06—De-registration or detaching
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/08—Access restriction or access information delivery, e.g. discovery data delivery
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0055—Transmission or use of information for re-establishing the radio link
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/08—Reselecting an access point
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/24—Reselection being triggered by specific parameters
    • H04W36/30—Reselection being triggered by specific parameters by measured or perceived connection quality data
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/30—Connection release
    • H04W76/38—Connection release triggered by timers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W84/00—Network topologies
    • H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
    • H04W84/04—Large scale networks; Deep hierarchical networks
    • H04W84/042—Public Land Mobile systems, e.g. cellular systems
    • H04W84/045—Public Land Mobile systems, e.g. cellular systems using private Base Stations, e.g. femto Base Stations, home Node B
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H04W24/10—Scheduling measurement reports ; Arrangements for measurement reports

Definitions

  • the present invention relates to wireless communications, and more particularly, to a method and apparatus for processing a change in a closed subscriber group (CSG) subscription in a wireless communication system.
  • CSG closed subscriber group
  • 3GPP LTE long term evolution
  • UMTS Universal Mobile Telecommunications System
  • 3GPP LTE uses orthogonal frequency division multiple access (OFDMA) in downlink and single carrier-frequency division multiple access (SC-FDMA) in uplink.
  • OFDMA orthogonal frequency division multiple access
  • SC-FDMA single carrier-frequency division multiple access
  • MIMO multiple input multiple output
  • LTE-A 3GPP LTE-Advanced
  • CSGs Closed Subscriber Groups
  • HNB home eNodeB
  • CSG cell a cell providing an authorized service to subscribers of the CSG.
  • the basic requirements of CSG in 3GPP are described in 3GPP TS 22.220 V1.0.1 (2008-12) "Service requirements for Home NodeBs and Home eNodeBs (Release 9)".
  • CSG services are provided at a higher price than other general wireless communication services, it is essential to provide high quality services.
  • CSG subscription There may be a change of CSG subscription while CSG service is being provided. For example, the CSG service of the terminal expires.
  • the present invention provides a method and apparatus for handling a change in CSG subscription in a wireless communication system.
  • the present invention also provides a method and apparatus for handling the expiration of a CSG subscription in a wireless communication system.
  • a method for handling a change in a Closed Subscriber Group (CSG) subscription in a wireless communication system.
  • the method includes a non-access stratum (NAS) layer receiving an expiration of a CSG subscription for a CSG cell through a NAS message from a network, the NAS layer notifying the expiration of the CSG subscription to an access stratum (AS) layer, and An AS layer sending an expiration of a CSG subscription to the CSG cell.
  • NAS non-access stratum
  • AS access stratum
  • the NAS message may be received while receiving CSG service from the CSG cell.
  • the method may further include reporting, by the AS layer, a measurement result for a neighbor cell to the CSG cell. After reporting the measurement result, the method may further include receiving a handover command from the CSG cell.
  • the method may further include receiving a disconnection from the CSG cell after sending the expiration of the CSG subscription, and performing cell reselection after receiving the disconnection.
  • the method may include starting a temporary timer when the NAS layer informs the AS layer of the expiration of a CSG subscription, and when the NAS timer expires, the NAS layer notifies the AS layer of the disconnection. .
  • a terminal for handling a change in a Closed Subscriber Group (CSG) subscription in a wireless communication system.
  • the terminal includes a radio frequency (RF) unit for transmitting and receiving a radio signal, and a processor connected to the RF unit to implement a radio interface protocol, wherein the processor includes a non-access stratum (NAS) layer from a network.
  • RF radio frequency
  • NAS non-access stratum
  • AS access Stratum
  • the UE If the CSG subscription is changed while receiving the CSG service, the UE notifies the HNB of the change of the CSG subscription.
  • the HNB can take appropriate action in accordance with the change in CSG subscription.
  • FIG. 1 shows a wireless communication system to which the present invention is applied.
  • FIG. 2 is a block diagram illustrating a radio protocol structure for a user plane.
  • FIG. 3 is a block diagram illustrating a radio protocol architecture for a control plane.
  • FIG. 4 is an exemplary diagram illustrating a network structure for operating an HNB using an HNB gateway.
  • FIG. 5 is a flowchart illustrating a method in which a terminal checks a connection mode of a base station.
  • FIG. 6 is a flowchart illustrating an example in which a CSG service is set up.
  • FIG. 7 is a flow chart illustrating a problem due to CSG expiration.
  • FIG. 8 is a flowchart illustrating a CSG service supporting method according to an embodiment of the present invention.
  • FIG. 9 is a flowchart illustrating a CSG service supporting method according to another embodiment of the present invention.
  • FIG. 10 is a flowchart illustrating a CSG service supporting method according to another embodiment of the present invention.
  • FIG. 11 is a flowchart illustrating a CSG service supporting method according to another embodiment of the present invention.
  • FIG. 12 is a flowchart illustrating a CSG service supporting method according to another embodiment of the present invention.
  • FIG. 13 is a flowchart illustrating a CSG service supporting method according to another embodiment of the present invention.
  • FIG. 14 is a block diagram illustrating a wireless communication system in which an embodiment of the present invention is implemented.
  • E-UTRAN Evolved-UMTS Terrestrial Radio Access Network
  • LTE Long Term Evolution
  • the E-UTRAN includes a base station (BS) 20 that provides a control plane and a user plane to a user equipment (UE).
  • the terminal 10 may be fixed or mobile and may be called by other terms such as a mobile station (MS), a user terminal (UT), a subscriber station (SS), a mobile terminal (MT), a wireless device (Wireless Device), and the like.
  • the base station 20 refers to a fixed station communicating with the terminal 10, and may be referred to by other terms such as an evolved-NodeB (eNB), a base transceiver system (BTS), an access point, and the like.
  • eNB evolved-NodeB
  • BTS base transceiver system
  • access point and the like.
  • the base stations 20 may be connected to each other through an X2 interface.
  • the base station 20 is connected to a Serving Gateway (S-GW) through an MME (Mobility Management Entity) and an S1-U through an Evolved Packet Core (EPC) 30, more specifically, an S1-MME through an S1 interface.
  • S-GW Serving Gateway
  • MME Mobility Management Entity
  • EPC Evolved Packet Core
  • EPC 30 is composed of MME, S-GW and P-GW (Packet Data Network-Gateway).
  • the MME has information about the access information of the terminal or the capability of the terminal, and this information is mainly used for mobility management of the terminal.
  • S-GW is a gateway having an E-UTRAN as an endpoint
  • P-GW is a gateway having a PDN as an endpoint.
  • Layers of the radio interface protocol between the terminal and the network are based on the lower three layers of the Open System Interconnection (OSI) reference model, which is widely known in communication systems.
  • L2 second layer
  • L3 third layer
  • the RRC Radio Resource Control
  • the RRC layer located in the third layer plays a role of controlling radio resources between the terminal and the network. To this end, the RRC layer exchanges an RRC message between the terminal and the base station.
  • FIG. 2 is a block diagram illustrating a radio protocol architecture for a user plane.
  • 3 is a block diagram illustrating a radio protocol structure for a control plane.
  • the data plane is a protocol stack for user data transmission
  • the control plane is a protocol stack for control signal transmission.
  • a physical layer (PHY) layer provides an information transfer service to a higher layer using a physical channel.
  • the physical layer is connected to a medium access control (MAC) layer, which is an upper layer, through a transport channel. Data is moved between the MAC layer and the physical layer through the transport channel. Transport channels are classified according to how and with what characteristics data is transmitted over the air interface.
  • MAC medium access control
  • the physical channel is modulated by an orthogonal frequency division multiplexing (OFDM) scheme and utilizes time and frequency as radio resources.
  • OFDM orthogonal frequency division multiplexing
  • the functions of the MAC layer include mapping between logical channels and transport channels and multiplexing / demultiplexing into transport blocks provided as physical channels on transport channels of MAC service data units (SDUs) belonging to the logical channels.
  • the MAC layer provides a service to a Radio Link Control (RLC) layer through a logical channel.
  • RLC Radio Link Control
  • RLC layer Functions of the RLC layer include concatenation, segmentation, and reassembly of RLC SDUs.
  • QoS Quality of Service
  • the RLC layer has a transparent mode (TM), an unacknowledged mode (UM), and an acknowledged mode (Acknowledged Mode).
  • TM transparent mode
  • UM unacknowledged mode
  • Acknowledged Mode acknowledged mode
  • AM Three modes of operation (AM).
  • AM RLC provides error correction through an automatic repeat request (ARQ).
  • PDCP Packet Data Convergence Protocol
  • Functions of the Packet Data Convergence Protocol (PDCP) layer in the user plane include delivery of user data, header compression, and ciphering.
  • the functionality of the Packet Data Convergence Protocol (PDCP) layer in the user plane includes the transfer of control plane data and encryption / integrity protection.
  • the RRC (Radio Resource Control) layer is defined only in the control plane.
  • the RRC layer is responsible for the control of logical channels, transport channels, and physical channels in connection with configuration, re-configuration, and release of radio bearers.
  • RB means a logical path provided by the first layer (PHY layer) and the second layer (MAC layer, RLC layer, PDCP layer) for data transmission between the terminal and the network.
  • the establishment of the RB means a process of defining characteristics of a radio protocol layer and a channel to provide a specific service, and setting each specific parameter and operation method.
  • RB can be divided into SRB (Signaling RB) and DRB (Data RB).
  • the SRB is used as a path for transmitting RRC messages in the control plane
  • the DRB is used as a path for transmitting user data in the user plane.
  • the terminal If there is an RRC connection between the RRC layer of the terminal and the RRC layer of the E-UTRAN, the terminal is in the RRC connected state (RRC_CONNECTED), otherwise it is in the RRC idle state (RRC_IDLE).
  • the downlink transmission channel for transmitting data from the network to the UE includes a BCH (Broadcast Channel) for transmitting system information and a downlink shared channel (SCH) for transmitting user traffic or control messages.
  • Traffic or control messages of a downlink multicast or broadcast service may be transmitted through a downlink SCH or may be transmitted through a separate downlink multicast channel (MCH).
  • the uplink transport channel for transmitting data from the terminal to the network includes a random access channel (RACH) for transmitting an initial control message and an uplink shared channel (SCH) for transmitting user traffic or control messages.
  • RACH random access channel
  • SCH uplink shared channel
  • BCCH broadcast control channel
  • PCCH paging control channel
  • CCCH common control channel
  • MCCH multicast control channel
  • MTCH multicast traffic
  • the physical channel is composed of several symbols in the time domain and several sub-carriers in the frequency domain.
  • One sub-frame consists of a plurality of symbols in the time domain.
  • One subframe consists of a plurality of resource blocks, and one resource block consists of a plurality of symbols and a plurality of subcarriers.
  • each subframe may use specific subcarriers of specific symbols (eg, the first symbol) of the corresponding subframe for the physical downlink control channel (PDCCH), that is, the L1 / L2 control channel.
  • the transmission time interval (TTI) which is a unit time for transmitting data, is 1 ms corresponding to one subframe.
  • the RRC state refers to whether or not the RRC layer of the UE is in a logical connection with the RRC layer of the E-UTRAN. If connected, the RRC layer is connected to the RRC_CONNECTED state. It is called (RRC_IDLE state). Since the UE in the RRC_CONNECTED state has an RRC connection, the E-UTRAN can grasp the existence of the UE in units of cells, and thus can effectively control the UE. On the other hand, the UE in the RRC_IDLE state cannot be grasped by the E-UTRAN, and the core network manages the tracking area unit, which is a larger area unit than the cell. That is, the UE in the RRC_IDLE state is only detected in a large area unit and must move to the RRC_CONNECTED state in order to receive a normal mobile communication service such as voice or data.
  • the terminal When the user first powers on the terminal, the terminal first searches for an appropriate cell and then stays in the RRC_IDLE state in the cell. When it is necessary to establish an RRC connection, the UE staying in the RRC_IDLE state makes an RRC connection with the E-UTRAN through an RRC connection procedure and transitions to the RRC_CONNECTED state. There are several cases in which a UE in RRC_IDLE state needs to establish an RRC connection. For example, an uplink data transmission is necessary due to a user's call attempt, or a paging message is received from E-UTRAN. In one case, the response message may be transmitted.
  • the non-access stratum (NAS) layer located above the RRC layer performs functions such as session management and mobility management.
  • EMM-REGISTERED EPS Mobility Management-REGISTERED
  • EMM-DEREGISTERED EMM-DEREGISTERED
  • the initial terminal is in the EMM-DEREGISTERED state, and the terminal performs a process of registering with the corresponding network through an initial attach procedure to access the network. If the attach procedure is successfully performed, the UE and the MME are in the EMM-REGISTERED state.
  • an EPS Connection Management (ECM) -IDLE state In order to manage a signaling connection between the UE and the EPC, two states are defined, an EPS Connection Management (ECM) -IDLE state and an ECM-CONNECTED state, and these two states are applied to the UE and the MME.
  • ECM EPS Connection Management
  • ECM-IDLE state When the UE in the ECM-IDLE state establishes an RRC connection with the E-UTRAN, the UE is in the ECM-CONNECTED state.
  • the MME in the ECM-IDLE state becomes the ECM-CONNECTED state when it establishes an S1 connection with the E-UTRAN.
  • the E-UTRAN does not have context information of the terminal.
  • the UE in the ECM-IDLE state performs a terminal-based mobility related procedure such as cell selection or cell reselection without receiving a command from the network.
  • a terminal-based mobility related procedure such as cell selection or cell reselection without receiving a command from the network.
  • the terminal when the terminal is in the ECM-CONNECTED state, the mobility of the terminal is managed by the command of the network.
  • the terminal In the ECM-IDLE state, if the position of the terminal is different from the position known by the network, the terminal informs the network of the corresponding position of the terminal through a tracking area update procedure.
  • System information includes essential information that the terminal needs to know in order to access the base station. Therefore, the terminal must receive all system information before accessing the base station, and must always have the latest system information. In addition, since the system information is information that all terminals in a cell should know, the base station periodically transmits the system information.
  • the system information includes a master information block (MIB) and a scheduling block (SB). , SIB System Information Block).
  • MIB master information block
  • SB scheduling block
  • the MIB enables the UE to know the physical configuration of the cell, for example, bandwidth.
  • SB informs transmission information of SIBs, for example, a transmission period.
  • SIB is a collection of related system information. For example, some SIBs contain only information of neighboring cells, and some SIBs contain only information of an uplink radio channel used by the terminal.
  • services provided by a network to a terminal can be classified into three types as follows.
  • the terminal also recognizes the cell type differently according to which service can be provided. The following describes the service type first, followed by the cell type.
  • Normal service This service means a public use for general use, and can be provided in a suitable or normal cell.
  • This service means service for network operator. This cell can be used only by network operator and not by general users.
  • the cell types may be classified as follows.
  • Acceptable cell A cell in which the terminal can receive limited service. This cell is a cell that is not barred from the viewpoint of the terminal and satisfies the cell selection criteria of the terminal.
  • Normal cell The cell that the terminal can receive a regular service. This cell satisfies the conditions of an acceptable cell and at the same time satisfies additional conditions. As an additional condition, this cell must belong to a PLMN to which the terminal can access and must be a cell which is not prohibited from performing a tracking area update procedure of the terminal. If the cell is a CSG cell, the terminal should be a cell that can be connected to the cell as a CSG member.
  • Barred cell A cell that broadcasts information that a cell is a prohibited cell through system information.
  • Reserved cell A cell that broadcasts information that a cell is a reserved cell through system information.
  • CSG Closed Subscriber Group
  • a base station providing a CSG service is called a home node b (HNB) or a home enode b (henb) in 3GPP.
  • HNB home node b
  • henb home enode b
  • 3GPP 3rd Generation Partnership Project
  • FIG. 4 is an exemplary diagram illustrating a network structure for operating an HNB using an HNB gateway (GW).
  • GW HNB gateway
  • the HNBs are connected to the EPC or directly to the EPC via the HNB GW.
  • the HNB GW looks like a typical BS to the MME.
  • the HNB GW also looks like the MME to the HNB. Therefore, the HNB and the HNB GW are connected to the S1 interface, and the HNB GW and the EPC are also connected to the S1 interface.
  • the HNB and the EPC are directly connected, they are connected to the S1 interface.
  • the function of the HNB is mostly the same as that of the general BS.
  • the HNB has a lower wireless transmission power than the BS owned by the mobile network operator. Therefore, the coverage provided by the HNB is generally smaller than the coverage provided by the BS. Due to this characteristic, a cell provided by an HNB is often classified as a femto cell in comparison with a macro cell provided by a BS in view of a service area.
  • the cell provided by this HNB is called a CSG cell.
  • Each CSG has its own unique identifier, which is called a CSG identity (CSG identity).
  • the terminal may have a list of CSGs belonging to the member, and the CSG list may be changed by a request of the terminal or a command of the network.
  • one HNB can support one CSG.
  • the terminal has a list of CSGs registered as members, which is called a CSG white list.
  • the HNB delivers the CSG ID of the CSG supported by the HNB through the system information so that only the member terminals of the corresponding CSG are connected.
  • the UE finds a CSG cell, it can check which CSG the CSG cell supports by reading the CSG ID included in the system information.
  • the terminal reading the CSG ID is regarded as a cell that can access the cell only when the UE is a member of the CSG cell, that is, when the CSG corresponding to the CSG ID is included in its CSG whitelist.
  • HNB does not always need to allow access to the CSG terminal. Depending on the configuration setting of the HNB, it is also possible to allow the connection of the terminal other than the CSG member. Which UE is allowed to access is changed according to the configuration setting of the HNB, where the configuration setting refers to the setting of the connection mode (or operation mode) of the HNB.
  • the access mode of the HNB is classified into three types according to which UE provides a service.
  • Closed access mode A mode that provides services only to specific CSG members.
  • the HNB provides a CSG cell.
  • Open access mode A mode that provides a service without the restriction of a specific CSG member like a general BS.
  • the HNB provides a generic cell that is not a CSG cell.
  • a macro cell is generally defined as a cell operated in an open access mode.
  • Hybrid mode A mode in which a CSG service can be provided to a specific CSG member and a service is provided to a non-CSG member like a normal cell.
  • CSG member UEs are recognized as CSG cells, and non-CSG member UEs are recognized as normal cells. Such a cell is called a hybrid cell.
  • the HNB informs the UE whether the cell it serves is a general cell, which is a CSG cell, so as to know whether the UE can access the cell.
  • the HNB operating in the closed access mode broadcasts through the system information that it is a CSG cell.
  • the HNB operating in open access mode broadcasts via system information that it is not a CSG cell.
  • the HNB includes a CSG indicator in the system information indicating whether the cell it serves is a CSG cell or not.
  • the CSG cell broadcasts by setting the CSG indicator to 'TRUE'.
  • the CSG indicator may be set to 'FALSE' or a method of omitting CSG indicator transmission may be used.
  • the general BS may also transmit a CSG indicator (eg, the CSG indicator set to 'FALSE') to let the UE know that the cell type provided by the UE is the general cell.
  • the general BS may not let the UE know that the cell type provided by the UE is a general cell by not transmitting the CSG indicator.
  • Table 1 shows CSG related parameters transmitted by a corresponding cell for each cell type.
  • the CSG related parameters may be transmitted through system information.
  • Table 2 shows the types of terminals that allow connection by cell type.
  • FIG. 5 is a flowchart illustrating a method in which a terminal checks a connection mode of a base station.
  • the terminal first checks the CSG indicator in the system information of the target cell in order to identify what type of cell the target cell is (S510).
  • the terminal After checking the CSG indicator, if the CSG indicator indicates that the target cell is a CSG cell, the terminal recognizes the corresponding cell as a CSG cell (S520, S530). Thereafter, the terminal checks the CSG ID in the system information to check whether the UE is a CSG member of the target cell (S540).
  • the terminal determines that the UE is a CSG member of the target cell from the CSG ID, the terminal recognizes the corresponding cell as an accessible CSG cell (S550 and S560). If the terminal confirms that the UE is not a CSG member of the target cell from the CSG identifier, the terminal regards the cell as an inaccessible cell (S550 and S570).
  • the terminal recognizes the target cell as a general cell (S520 and S580). In addition, if the CSG indicator is not transmitted in step S510, the terminal recognizes the target cell as a general cell.
  • a CSG cell and a macro cell may be operated simultaneously at a specific frequency.
  • a frequency in which only a CSG cell exists is called a CSG dedicated frequency.
  • the frequency at which the CSG cell and the macro cell exist simultaneously is called a mixed carrier frequency.
  • the network may reserve a particular physical layer cell identifier for the CSG cell separately at the mixed carrier frequency.
  • the physical layer cell identifier is called PCI (Physical Cell Identity) in the E-UTRAN system and PSC (Physical Scrambling Code) in the UTRAN.
  • PCI Physical Cell Identity
  • PSC Physical Scrambling Code
  • the CSG cell informs the system about the PCI reserved for the CSG cell at the current frequency.
  • the UE can determine whether a cell is a CSG cell or not a CSG cell from PCI of this cell when it discovers a cell at a corresponding frequency. The following describes how two terminals use this information.
  • the UE does not need to consider the CSG cell as a selectable cell in a cell selection / reselection process or handover.
  • the terminal checks only the PCI of the cell, and if the PCI is a PCI reserved for the CSG, the terminal may immediately exclude the cell from the cell selection / reselection process or handover.
  • the PCI of a cell can be known immediately at the terminal when the physical layer confirms the existence of the cell.
  • the CSG identifier of the system information of all cells found in the entire PCI range instead of verifying, we only know that the cell with the PCI reserved for CSG can know that the cell is a CSG cell.
  • the terminal implements a NAS layer and an AS (Access Straum) layer.
  • the AS layer refers to a layer below the third layer of the radio interface protocol.
  • the terminal receives the CSG indicator and the CSG ID from the HNB (S610).
  • the NAS of the terminal receives the service request, and checks whether it is a member subscribed to the CSG cell of the HNB (S615). In this case, the terminal is called a CSG member terminal of the HNB.
  • the RRC of the UE sends an RRC connection request to the HNB (S620).
  • the HNB sends a connection request to the MME (S625) and receives a connection permission from the MME (S630). Accordingly, the HNB sends an RRC connection setup message to the terminal (S635).
  • the RRC of the terminal sends a connection setup to the NAS (S640). Thereafter, the CSG service negotiation and authentication are performed (S645).
  • the CSG service is started (S650). As the CSG service is started, the CSG timer may be started. While the CSG timer is running, the CSG service may be provided from the CSG cell. When the CSG timer expires, the CSG service expires.
  • the CSG timer can run on the NAS and / or AS.
  • the MME communicates with the terminal through the NAS protocol.
  • the base station only forwards the NAS message received from the MME to the terminal and does not decode the message. Thus the NAS message is transparent to the base station.
  • the CSG whitelist of the terminal is managed by the MME.
  • the MME may instruct to delete, change, or add a CSG in the CSG whitelist stored by the UE.
  • the MME may instruct the UE to add the CSG or delete the CSG.
  • FIG. 7 is a flow chart illustrating a problem due to CSG expiration.
  • the terminal is a CSG member, and the CSG supported by the HNB is included in the white list of the terminal (S710). Therefore, the terminal receives the CSG member service from the HNB (S720).
  • the MME notifies the CSG expiration of the CSG service corresponding to the NAS of the terminal through the NAS message (S730). Therefore, the terminal becomes a CSG non-member of the HNB (S740).
  • the UE may continue to maintain the CSG member service (S750).
  • the MME instructs the terminal to change the CSG whitelist
  • the MME communicates with the terminal through the NAS protocol. Therefore, the HNB cannot know whether the CSG whitelist has changed until the MME directly informs the HNB.
  • the MME is notified of the end of the current CSG subscription of the CSG cell, the terminal is no longer a CSG member.
  • the MME does not directly notify the end of the CSG subscription to the CSG cell, the CSG cell can not take any action to the terminal. That is, there is a problem that the CSG non-member terminal continues to receive CSG member services in the CSG cell.
  • the UE may optionally inform the HNB of the expiration of the corresponding CSG subscription. If the UE is no longer a CSG member of the currently connected CSG cell, the UE may perform cell reselection to another cell.
  • the change of the CSG subscription of the terminal may mean the expiration of the CSG subscription, the expiration of the CSG subscription, and / or the addition of the CSG subscription of the terminal.
  • the base station may instruct the corresponding terminal to move to another cell or adjust the quality of service (QoS) of the terminal.
  • QoS quality of service
  • the UE When the UE informs the base station of the change of the CSG subscription, it may report including the measurement result (measurement result) for the neighbor cell. If the subscription of the CSG is about to expire, the terminal may actively perform measurement on neighboring cells to report a measurement result. When the base station receives the measurement result, the base station may transmit a command to move to the other cell to the terminal based on the measurement result.
  • the terminal may perform a cell selection or cell reselection procedure.
  • the UE may perform a cell selection or cell reselection procedure either actively or passively.
  • the UE may regard the previously connected CSG cell as an inaccessible cell.
  • the movement to another cell may be initiated by a command for the terminal to move to another cell or another frequency from the base station (eg, an RRC connection release or a handover command).
  • a command for the terminal to move to another cell or another frequency from the base station eg, an RRC connection release or a handover command.
  • the base station transmits a command to the mobile station to move to another cell or another frequency may include an instruction to exclude the previously connected CSG cell from the cell selection / reselection procedure.
  • the release cause field in the RRC connection release message indicates that the CSG expires.
  • FIG. 8 is a flowchart illustrating a CSG service supporting method according to an embodiment of the present invention.
  • the UE and the HNB are in the CSG service (S810).
  • the MME notifies the NAS of the terminal of the CSG expiration (S820).
  • the MME sends a NAS message indicating the expiration of the CSG to the HNB to notify the UE that the CSG service of the CSG cell connected to the CSG member has expired, and the HNB forwards the NAS message received from the MME to the UE as it is. . Since the base station does not decode the received NAS message, it does not know that the NAS message indicates CSG expiration. Therefore, the HNB does not know that the UE is no longer a CSG member.
  • the NAS of the terminal When the NAS of the terminal receives the NAS message sent by the MME, the NAS confirms that the CSG subscription for the CSG cell of the currently connected HNB expires. The NAS of the terminal releases the subscription expiration of the CSG, and instructs the RRC of the terminal to release the RRC connection with the current cell (S830).
  • the UE with the RRC connection state is switched to the RRC idle state (S840).
  • the UE performs a cell reselection procedure (S850).
  • the previously connected CSG cell may be excluded from the candidate cell to be reselected.
  • the HNB can provide CSG services to other CSG member terminals more stably.
  • FIG. 9 is a flowchart illustrating a CSG service supporting method according to another embodiment of the present invention.
  • the UE and the HNB are in the CSG service (S910).
  • the MME notifies the NAS of the CSG expiration (S920).
  • the NAS of the terminal When the NAS of the terminal receives the NAS message transmitted by the MME, the NAS confirms that the CSG subscription to the CSG cell of the currently connected HNB expires. The NAS of the terminal instructs the RRC of the subscription expiration of the CSG (S930).
  • the AS of the UE informs the HNB of the expiration of the CSG (S940).
  • the UE may inform the HNB of the CSG expiration as an RRC message, a MAC message or a physical layer message.
  • the HNB Upon receiving the CSG subscription expiration from the UE, the HNB informs the UE of the RRC connection release due to the release of the CSG expiration (S950).
  • the UE performs a cell reselection procedure (S960).
  • the previously connected CSG cell may be excluded from the candidate cell to be reselected. That is, the terminal reselects another cell except the existing CSG cell.
  • the HNB may provide a service to the CSG non-member terminal. Therefore, even if the HNB entering the hybrid mode receives the CSG expiration notification from the terminal, the HNB may provide a service as a CSG non-member terminal without sending a disconnection.
  • the UE informs the HNB of the CSG subscription state, so that the HNB can provide more stable CSG service to the CSG member UE.
  • FIG. 10 is a flowchart illustrating a CSG service supporting method according to another embodiment of the present invention.
  • the UE and the HNB are in the CSG service (S1010).
  • the MME notifies the NAS of the terminal of the CSG expiration (S1020).
  • the NAS of the terminal When the NAS of the terminal receives the NAS message transmitted by the MME, the NAS confirms that the CSG subscription to the CSG cell of the currently connected HNB expires. The NAS of the terminal instructs the RRC of the subscription expiration of the CSG (S1030).
  • the AS of the UE informs the HNB of the expiration of the CSG (S1040).
  • the UE may inform the HNB of the CSG expiration as an RRC message, a MAC message or a physical layer message.
  • the RRC of the UE reports the measurement result of the neighbor cell to the HNB (S1050).
  • the AS of the terminal may start measuring the signal of the neighbor cell.
  • the measurement report message including the measurement result may include a field indicating the CSG expiration. That is, the measurement report and the CSG expiration may be delivered to the HNB as one message.
  • the HNB Upon receiving the CSG expiration and the measurement result, the HNB prepares for handover (S1060).
  • the HNB sends a handover command to the terminal to allow the terminal to perform handover to another cell (S1070).
  • the HNB may provide a service to the CSG non-member terminal. Therefore, even if the HNB entering the hybrid mode receives the CSG expiration notification from the terminal, the HNB may provide a service as a CSG non-member terminal without sending a handover command.
  • FIG. 11 is a flowchart illustrating a CSG service supporting method according to another embodiment of the present invention.
  • the UE and the HNB are in the CSG service (S1110).
  • the MME notifies the NAS of the terminal of the CSG expiration (S1120).
  • the NAS of the terminal When the NAS of the terminal receives the NAS message transmitted by the MME, the NAS confirms that the CSG subscription to the CSG cell of the currently connected HNB expires. The NAS of the terminal instructs the RRC of the subscription expiration of the CSG (S1130).
  • the AS of the UE informs the HNB of the expiration of the CSG (S1140). Simultaneously or separately with CSG expiration, the UE may send a measurement report to the HNB (S1150).
  • the NAS of the terminal instructs the RRC to expire the subscription of the CSG, and starts a temporary timer (S1160). If an RRC disconnection or handover command is received from the HNB while the temporary timer is running, the temporary timer may be stopped and cell reselection or handover may be performed.
  • the NAS of the terminal instructs the RRC of the terminal to release the RRC connection with the current cell on the ground of releasing the subscription of the CSG (S1170).
  • the UE performs a cell reselection procedure (S1180).
  • the previously connected CSG cell may be excluded from the candidate cell to be reselected.
  • the UE When the UE is notified of the CSG subscription expiration, it starts a temporary timer. While the temporary timer is in operation, it waits for an indication from the HNB. If no instruction is received until the temporary timer expires, the cell reselects itself.
  • FIG. 12 is a flowchart illustrating a CSG service supporting method according to another embodiment of the present invention.
  • the UE and the HNB are in the CSG service (S1210).
  • the MME notifies the NAS of the terminal of the CSG expiration (S1220).
  • the NAS of the terminal When the NAS of the terminal receives the NAS message transmitted by the MME, the NAS confirms that the CSG subscription to the CSG cell of the currently connected HNB expires. The NAS of the terminal instructs the RRC of the subscription expiration of the CSG (S1230).
  • the AS of the UE notifies the HNB of the expiration of the CSG (S1240). Simultaneously or separately with CSG expiration, the UE may send a measurement report to the HNB (S1250).
  • the AS of the UE notifies the HNB of the subscription expiration of the CSG, and starts a temporary timer (S1260). If an RRC disconnection or handover command is received from the HNB while the temporary timer is running, the temporary timer may be stopped and cell reselection or handover may be performed.
  • the UE When the temporary timer expires, the UE performs a cell reselection procedure in the RRC idle state (S1270). In this case, the previously connected CSG cell may be excluded from the candidate cell to be reselected.
  • FIG. 13 is a flowchart illustrating a CSG service supporting method according to another embodiment of the present invention. This is the case when the HNB provides a plurality of CSG cells.
  • the HNB supports CSG-A and CSG-B
  • the CSG whitelist of the UE also includes CSG-A and CSG-B.
  • the UE and the HNB are in the CSG service as the CSG-A member (S1310).
  • the MME notifies the NAS of the terminal of the service expiration of the CSG-A (S1320). That is, the MME requests the terminal to delete the CSG-A from the CSG whitelist.
  • the NAS of the terminal When the NAS of the terminal receives the NAS message transmitted by the MME, the NAS confirms that the CSG subscription with respect to the CSG-A of the currently connected HNB expires. The NAS of the terminal instructs the RRC of the subscription expiration of the CSG-A (S1330).
  • the AS of the UE notifies the HNB of the expiration of the CSG-A (S1340).
  • the UE may inform the HNB that it is a member of the CSG-B. That is, the UE notifies the CSG-A subscription expiration, and then informs the HNB that the CSG service is provided as a member of the CSG-B.
  • the HNB Since the UE is still a member of the CSG-B where the HNB can receive the CSG service, the HNB does not instruct a procedure for moving the UE to another cell, and negotiates QoS for the CSG-B service with the MME (S1350).
  • the HNB as a member of CSG_B, provides the CSG service service to the UE (S1360).
  • the UE If the CSG subscription is changed while receiving the CSG service, the UE notifies the HNB of the change of the CSG subscription.
  • the HNB can take appropriate action in accordance with the change in CSG subscription.
  • the CSG expiration illustrates that the MME notifies through a NAS message, but the CSG expiration may be initiated by the expiration of the CSG timer.
  • the base station 50 includes a processor 51, a memory 52, and an RF unit 53.
  • the memory 52 is connected to the processor 51 and stores various information for driving the processor 51.
  • the RF unit 53 is connected to the processor 51 and transmits and / or receives a radio signal.
  • the processor 51 implements the proposed functions, processes and / or methods. Layers of the air interface protocol may be implemented by the processor 51.
  • the processor 51 may send CSG related information, and instruct the terminal 60 to take an action according to the change of the CSG subscription.
  • the terminal 60 includes a processor 61, a memory 62, and an RF unit 63.
  • the memory 62 is connected to the processor 61 and stores various information and a CSG white list for driving the processor 61.
  • the RF unit 63 is connected to the processor 61 and transmits and / or receives a radio signal.
  • the processor 61 implements the proposed functions, processes and / or methods. Layers of the air interface protocol may be implemented by the processor 61.
  • the processor 61 implements the NAS layer and the AS layer, and handles the change of the CSG subscription.
  • Processors 51 and 61 may include application-specific integrated circuits (ASICs), other chipsets, logic circuits, and / or data processing devices.
  • the memory 52, 62 may include read-only memory (ROM), random access memory (RAM), flash memory, memory cards, storage media, and / or other storage devices.
  • the RF unit 53 and 63 may include a baseband circuit for processing a radio signal.
  • the above-described technique may be implemented as a module (process, function, etc.) for performing the above-described function. Modules are stored in memories 52 and 62 and can be executed by processors 51 and 61.
  • the memories 52 and 62 may be inside or outside the processors 51 and 61, and may be connected to the processors 51 and 61 by various well-known means.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Computer Security & Cryptography (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

L’invention concerne un procédé et un appareil de traitement de modifications d'abonnement au sein d'un groupe d'abonnés fermé (CSG) dans un système de communication sans fil. Une strate d'accès interdit (NAS) d'un équipement utilisateur reçoit d'un réseau un message NAS indiquant que le délai du service CSG fourni à une cellule CSG a expiré. La NAS notifie l'expiration du délai du service CSG à un strate d'accès (AS), et celle-ci le transmet à la cellule CSG.
PCT/KR2010/001705 2009-03-20 2010-03-19 Procédé et appareil de traitement de modifications d'abonnement csg dans un système de communication sans fil WO2010107272A2 (fr)

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US61/161,845 2009-03-20
KR1020100024237A KR20100105492A (ko) 2009-03-20 2010-03-18 무선 통신 시스템에서 ｃｓｇ 가입의 변경을 처리하는 방법 및 장치
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